diff --git a/pkgs/development/python-modules/awkward/default.nix b/pkgs/development/python-modules/awkward/default.nix
index b39a72903876..53cd4671d2ca 100644
--- a/pkgs/development/python-modules/awkward/default.nix
+++ b/pkgs/development/python-modules/awkward/default.nix
@@ -5,20 +5,21 @@
 , numba
 , numpy
 , pytestCheckHook
+, pyyaml
 , rapidjson
 }:
 
 buildPythonPackage rec {
   pname = "awkward";
-  version = "1.3.0";
+  version = "1.4.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "b6021694adec9813842bad1987b837e439dabaf5b0dff9041201d238fca71fb4";
+    sha256 = "25ae6114d5962c717cb87e3bc30a2f6eaa232b252cf8c51ba805b8f04664ae0d";
   };
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ rapidjson ];
+  buildInputs = [ pyyaml rapidjson ];
   propagatedBuildInputs = [ numpy ];
 
   dontUseCmakeConfigure = true;